Rotary pump



awms

Aprii 29, 1924;

J. c. k-iANSEPkELLEHAR/IMER ROTARY PUMP Filed April 12. 1923 ZZZZQ Patented Apr. 29, 1924.

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-J'ACOIB CHRISTIAN HANSEN-ELLEHAMMER, 01E LERUP, DENIZIARK.

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. Application filed April 12, 1923. Serial No. 631,563.

7 '0 all whom it mag 'concewt:

Be it known that ,I, JACOB CHRISTIAN HANsEN-ELLEHAMMER, subject of the King ofDenmark, residing at Hellerup, Denmark, have invented certain new and useful Improvements in Rotary Pumps, of which the following is a specification.

The present invention relates to a rotary pump having an essentially circular fluid passage between the piston cylinder and the pump body which in the inoperative section has a projection separating the suction side from the delivery side. j I

The pumps of this kind heretofore employed show the disadvantage that they would quickly wear onthe guiding surfaces which are situated within the range of the fluid when the pump is employed for conveying impure water. This becomes partic- .ularly apparent when such water contains essential quantities of sandor grit which H within a very short time will completely wear out the guiding surfaces.

The present invention aims at obviating this disadvantage by disposing the entire controlling mechanism towards the center, outside of the range of the fluid so that the centrifugal forces on the fluid will hold sand particles and the like away from the guiding surfaces.

Furthermore, the enclosing walls of the pump body are made with pockets or recesses at such pointswhere the pistons pass from the inoperative section to the operative section. It is thereby obtained that the pistons are practically instantly relieved, as immediately on the pistons leaving the said pockets, the fluid can flow from the one side of the pistons to the other side.

It is clear from the above description that a pump like the one in question is partic:

ularly adapted to be used as a fire pump, the fact that the pump can deal with impure water being of the greatest importance in this respect.

In the accompanying drawing Fig. 1 is a vertical section through a con structional. form of the pump andatright angles to the spindle of the pump, and

Fig. 2'v is an axial section through the pump.

The pump has an essentially circular fluid passage 1 between the piston cylinder 2 and the pump body 3. The latter has on the inoperative section a projection 4 separating delivery side .12.

Within the piston cylinder 2 are disposed radially' slidable pistons 5 and 6 having tenons 7 and 8, respectively, outside of the fluid passage, and the axes of which are parallel to the axis, of rotation of the jump. These tenons are controlled by 'uide surfaces formed by the inner sides of cylindrical 'bodies .9 and 10 whichhave on their outside a circular cylindrical surface and on their inside a cylindrical surface, the axes of these two cylindrical surfaces being parallel to the axis of rotation of the pump. The guide surfaces are formed in such a manner that they will produw an even displacement of the piston or pistonsfrom their outer position, the operative position, to

In the wall of the pump body 3 are formed pockets or recesses 13, 14; at such points where the pistons pass from the inoperative position into operative position, and from operative position to inoperative position.

The operation of the ump is readily understood by regarding igure 1 where the fluidwhich, for example, at a given moment enters into the suction part 11 of the pump will by means 'of the piston 5 be carried downwards and round to the delivery side 12, F ions the foregoing it will be seen that the casing has inlet andoutlet ports 11 and 12 and has a circular bore forming with a circular piston cylinder 2 a circular fluid passage 1, the rotary piston cylinder 2 within said casing is co-axially with the bore and the circular fluid passage uninterruptedly surrounds the piston cylinder 2 to 180 of its circumference. The wall of the casing at both ends of said 180 fluid passage is provided with outwardly extending recesses 13 and 14 located substantially in a horizontal plane at the axial center line of the casing. The discharge port channel at the outlet end of the 180 fluid passage in direct continuation thereof is tangentially arranged with the outlet end of the 180 fluid passage. The barrier 4 .is arranged between the suction-and delivery ports 11 and 12 and extends towards the piston cylinder 2. The piston 5 is readily movable in the iston cylinder 2 and is directed outwardly fi'om the same to operative position by centrifugal force when i passing-through and crosses said 180 fluid passage. The piston is limited in its outward radial movement by means 7 or the like, which prevents frictional wearing contact of saidpiston on the wall forming the 180 fluid passage and in cooperating with the parts 9, 10 is retracted within the periphery of said cylinder to inoperative position during the remaining 180 travel of said cylinder 2.

The change from operative to inoperative,

and inoperative to operative position of the piston 5 takes place when the piston is in radial line with one of the recesses 13 or 14. Furthermore it will be seen that the other channel 11 is substantially tangential with the circular fluid passage 1 and with the recesses l3 and 14 and arranged on the juncture of the 180 fluid passagewith the inlet and outlet channels 11 and 12, the walls of the inlet and outlet channels forming continuations of the recesses.

This invention may be developed within the scope of the following claims without departing from the essential features of the same and it is desired that the specification and drawings be read as being merely illustrative and not in a limiting sense except as necessitated by the prior art.

.I claim: p I

1. In a rotary pump, the combination of a casing having inlet and outlet ports and having a circular bore, a rotary piston cylinder within said casing and co-axially with the bore forming therebetween a circular fluid passage uninterruptedly surrounding said cylinder 180 of its circumference, the wall of said casing at both ends of said 180 fluid passage being provided with outwardly extendingrecesses located substantially in a horizontal plane at the axial center line of the casing, a discharge port channel at the outlet end of the 180? fluid passage in direct continuation thereof tangentially with the oulet end of the 180 fluid passage, a barrier between the suction and delivery ports extendin to the cylinder, a piston radially movab e in the cylinder and directed outwardly from the same to operative position by centrifugal force when passing through and across said 180? fluid passage, means in said casing relatively stationary to said piston limiting the outward radial movement of the piston to prevent frictional wearing contact of said piston with the bore forming the 180 fluid passage, and retracting the piston within the periphery of said cylinder to inoperative position during the remaining 180 travel thereof, the change inoperative to inoperative, and inoperative to operative position of the piston taking place when the piston is in radial line-with one of said recesses.

2. In a rotary pump, the combination of a casing having a circular bore, a rotary piston. cylinder within said bore and arranged co-axially' witlrthe same so as to form an essentially circular fluid passage of said recesses being provided at the juncture 1 of the 180 fluid passage with the inlet and outlet channels, and the walls of the inlet and outlet channels forming continuations of the recesses where the piston passes from the inoperative to the operative position and vice versa and saidrecesses being located substantially in a horizontal plane of the axial center line of the casing and spaced 180 apart, pistons radially movable in the cylinder and directed outwardly by the rotation of the same by centrifugal force across said 180 fluid passage portion, and means in said casing relatively stationary in respect to said piston limiting the outward radial movement of the piston to prevent frictional wearing contact of said piston with the bore of the 180 passage portion, said means coacting with the piston to retract the same within the periphery of said cylinder during the remaining 180 travel thereof between the delivery and suction channels.

In testimony whereof I aflix my signature.

JACOB CHRISTIAN HANSEN-ELLEHAMMER. 

